Hello,

Theses error might be logged before the installation.

404 not found error is caused mostly due to missing .htaccess file.

Please check the following FAQ

Why am I getting 404 Not Found error after installation?

Please

1. make sure that your apache mod_rewite is enabled
2. check that .htaccess file is successfully uploaded and exists in the main directory of SMA
3. base_url in app/config/config.php

If you are using godaddy, please visit the codeigniter official guide here. You might need to check and modify you .htaccess files too.

Thank you,
The errorlog, you may be right. I transferred a clean new script to the server, then changed the error log to 1 in the config.php and then installed.
how can I check mod_rewrite to be enabled on the host server? The htaccess file says enabled.
The .htaccess file is identical to the running script on my testsite. There is also a different .htaccess file in the app directory.
this is the file in the main directory:

<IfModule mod_rewrite.c>

RewriteEngine On
# RewriteBase /forums/
RewriteCond $1 !^(index\.php|assets|install|update)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

# For godady Shared Hosting Server uncomment the line below
# RewriteRule ^(.*)$ index.php?/$1 [L]

# Please comment this if you have uncommented the above
RewriteRule ^(.*)$ index.php/$1 [NC,L,QSA]

</IfModule>


# Uncomment all line below to improve caching - remove # from start

# <IfModule mod_headers.c>
#   <FilesMatch ".(css|js)$">
#     Header set Cache-Control "max-age=7200, public"
#   </FilesMatch>
# </IfModule>

# <IfModule mod_expires.c>
# ExpiresActive On
# ExpiresByType image/jpg "access plus 1 year"
# ExpiresByType image/jpeg "access plus 1 year"
# ExpiresByType image/gif "access plus 1 year"
# ExpiresByType image/png "access plus 1 year"
# ExpiresByType text/css "access plus 1 month"
# ExpiresByType text/x-javascript "access plus 1 month"
# ExpiresByType image/x-icon "access plus 1 year"
# ExpiresDefault "access plus 2 days"
# </IfModule>

The base_url is also correct. https://visclubldh.pt/

Can it be possible that "only_full_group_by" is not disabled on the server?
I know on verygood.pt it is disabled and I use sql3.netim.hosting
I asked the same disabling for visclubldh.pt, but there was confusion. although they answered that it was disabled.

Thank you.

sorry for the stupid copy paste file.

I solved the problem with my host. They had put me on a nginx server instead of apache. therefore the htaccess file was not read.
Thank you.